Three Strikes Barrier (Starfoil) (SP18-EN045) [Star Pack VRAINS]

If your opponent controls exactly 3 cards: Activate 1 of these effects;
<br>• this turn, your monsters cannot be destroyed by battle.
<br>• this turn, you take no battle damage.
<br>• this turn, each time your monster inflicts battle damage to your opponent, you gain the same amount of LP.